Disney 5.1 uncompressed 48kHz audio - what is this?

[Scott]

So I have a Disney Ratatouille disc which has a 5.1 uncompressed 48kHz audio track. What is this? It's apparently not Dolby TrueHD or DTS-HD (or else I would think it would say that it is). Is this an audio track that can be played on a "regular" Dolby Digital / DTS-capable audio receiver (i.e, one that doesn't support Dolby TrueHD or DTS-HD) or is there some special capability my audio receiver would need to support in order to play this track?

[W&B]

It's also referred to as the PCM audio track and your reciever will have to have HDMI input to support that and also 5.1 and/or 7.1 channel output. I'm learning about this stuff myself and since the economy went downhill I put all that on hold but from what I've read that it's all kinds of awesome.